TS19372 Taiwan Semiconductor Company, Ltd. (TSC), TS19372 Datasheet - Page 3

• Manufacturer Part Number: TS19372
• Description: Buck Step-down Wled Driver With External Switch
• Manufacturer: Taiwan Semiconductor Company, Ltd. (TSC)

Application Information
Pin Description
Inductor Selection
A 100uH inductor is recommended for most TS19372 applications. Although small size and high efficiency are major
concerns, the inductor should have low core losses at 180kHz and low DCR (copper wire resistance).
Diode Selection
Schottky diodes, with their low forward voltage drop and fast reverse recovery, are the ideal choices for TS19372
applications. The forward voltage drop of a Schottky diode represents the conduction losses in the diode while the
diode capacitance represents the switching losses. For diode selection, both forward voltage drop and diode
capacitance need to be considered. Schottky diodes with higher current ratings usually have lower forward voltage
drop and larger diode capacitance, which can cause significant switching losses at the 180kHz switching frequency of
the TS19372.
Capacitor Selection
For Input capacitor and timing capacitor are able to use small ceramic capacitor for most of TS19372 applications.
When AC input, to add a 100µF electric capacitor for input capacitor is recommended.
Pin
1
2
3
4
5
Timing Capacitor
Function
Ground
I
SENSE
SW
VIN
Buck (Step-down) WLED Driver with External Switch
Description
Driver Switching Pin
Ground Pin.
Timing capacitor oscillator input
Peak current sense input to monitor the voltage drop across an external
resistor to limit the peak current through the circuit
Input Voltage Supply pin
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TS19372
Version: A09